Tuesday, March 7, 2023

LG home theater model HT302 came in with low audio output now repaired

I received this home theater from a customer who wanted it checked by a technician. 

Complains was low audio output, I inquired from him a brief history of the machine and told me that he bought the machine in 2007 and never taken it to a technician until last week it was working well but developed low output for the last few days.

I opened the machine and did a thorough scanning of the power supply board and mainboard and noted two capacitors with top part swollen.

I replaced them expecting it to solve the problem one touch but I was wrong, after changing the two capacitors there was still no change.

Since the customer hinted the machine was bought in the year 2007, means the machine has been working for the last 16 years failthfuly, therefore I decided to do more test on capacitors which from my experience they age faster than other components.

I did test all capacitors on the power board using an ESR meter and got several culprits as you can see below which according to my ESR meter they were way far from the normal capacitors.

I replaced all of them and now was time to test and see if there is improvement.

I loaded it with my USB flash disk and the results were awesome!


Thank you, guys,

See you in the next class

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1 comment:

  1. I love your blog. It's so full of interesting cases and the way that you describe your experiences makes it additionally enjoyable to read. Thank you for sharing it all and your marvellous electronics knowledge.